W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found ?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to "Power Circuit Inspection" procedure

Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect HO2S connector
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 5 of the HO2S heater harness connector and chassis ground.
A. Specification : B+




5. Is voltage within the specification ?
YES
1) Go to "Control Circuit Inspection" procedure
NO
1) Check for an open in the power supply circuit between the main relay and the HO2S.
2) Especially check for "10 A O2 Sensor fuse" is installed and not blown.
3) Repair as necessary and go to "Verification of Vehicle Repair" procedure

Control Circuit Inspection

Check for Open in Control Harness
1. Ignition "OFF"
2. Disconnect PCM connector
3. Measure resistance between terminals 6 of the HO2S heater harness connector and 93 of the ECM harness connector
A. Specification : Approx. 0 ohms




4. Is resistance within the specification ?
YES
1) Go to next step as below
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for Short to Ground in Control Circuit
1. Measure resistance between terminal 6 of the HO2S heater harness connector and chassis ground
A. Specification : infinite




2. Is resistance within the specification ?
YES
1) Go to next step as below
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for Short to Power in Control Circuit
1. Reconnect the PCM connector.
2. Ignition "ON" & Engine "OFF"
3. Measure voltage between terminal 6 of the HO2S heater harness connector and chassis ground
A. Specification : Approx 0V




4. Is voltage within the specification ?
YES
1) Go to "Component Inspection" procedure
NO
1) Repair open or short to ground in control circuit and go to "Verification of Vehicle Repair" procedure